KpATCC43816 Protein target profile

alpha/beta hydrolase fold family protein

Accession: VK055_0532

Gene: AIK79155.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GTK4
Length 501
Pocket druggability (P2Rank · AlphaFold DB model) 0.926
Direct ligand evidence 0 167 total records
Functional annotation 1 EC 1 GO
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.

Terms and data sources used on this page

PDB: experimentally determined structures from the Protein Data Bank. These are the strongest structural evidence, but may cover only part of the protein.

AlphaFold DB model: a precomputed predicted structure downloaded from AlphaFold Database/UniProt, not an experiment performed here.

ColabFold model: a predicted structure generated for this workspace; interpret it with coverage and confidence.

pLDDT: confidence score for predicted structures. High values support local geometry; low values mean the region should not drive pocket interpretation.

FPocket / P2Rank: software tools that predict possible ligand-binding pockets on a 3D structure. They are useful screening signals, not experimental validation.

Druggability: a pocket-based estimate of whether a small molecule could bind productively. It does not mean a drug already exists.

PDB ligand: a compound observed in an experimental structure. Direct same-protein records are stronger than homolog-transferred records.

ChEMBL: a public database of measured compound bioactivity. Direct entries are stronger than entries transferred from similar proteins.

ZINC: a purchasable-compound database. Here it marks proposed candidates from chemical similarity, not measured binders.

LigQ / LigQ_2: an internal Target pipeline step that gathers PDB, ChEMBL, and ZINC ligand evidence for each protein.

Off-target: sequence similarity to proteins we prefer not to hit, such as human proteins or beneficial gut microbiome proteins.

DEG: Database of Essential Genes. A match suggests the protein resembles genes known to be essential in other organisms.

Roary / CoreCruncher: pan-genome tools used to decide whether a gene is core across analyzed strains or accessory/strain-specific.

EC / GO: functional annotations: EC describes enzyme reactions; GO describes biological process, molecular function, or cellular component.

KEGG pathway: a curated metabolic route label used here to group reactions imported from the metabolic model.

Chokepoint: a metabolic reaction that is the only producer or consumer of a metabolite in the imported model.

Prioritization evidence

Selectivity, essentiality, structural confidence, conservation, and predicted binding-site evidence.

Off-target risk

Human off-target
Hit
Human identity (%)
57.971 Lower values reduce human off-target concern.
Human E-value
2.28e-13
Gut microbiome similarity
1.1% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
N
DEG identity (%)
33.636 Higher values support similarity to known essential genes.

Structure confidence

ColabFold pLDDT
93.87 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

P2Rank's binding-site probability is the primary druggability signal shown across the app; FPocket's druggability score is shown alongside it for comparison. Both estimate small-molecule pocket quality after applying the curated structure priority — neither is experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

Druggability (P2Rank) 0.926
Structure A0A0H3GTK4
Pocket Pocket 1
Druggability (FPocket) 0.932
Structure A0A0H3GTK4
Pocket Pocket 37
ColabFold model
P2Rank 0.934 · Pocket 1
FPocket 0.682 · Pocket 33
Core conservation Accessory gene
Roary core
CoreCruncher accessory
Gut microbiome 54 / 4744 genomes with a hit
Prevalence 1.1%

Metabolic context

Reactions catalyzed, pathway membership, and centrality in the genome-scale metabolic network.

This protein is not associated with the imported metabolic network for this genome.

Browse the genome's metabolic network

Imported from KpATCC43816.sbml · 2026-07-09

Sequence

Primary amino-acid sequence viewer.

MQHPSKPLAKTRQGTLAGSAEQGIHIWRGIPYAAPPVGPLRWRAPQPAARWQGVRPAETFSAASWQDIDYCRELGGGDPGAFSEDCLYLNVWAPASAAQPLPVMVWLHGGGFTIGAGSLPPYDGKALASRDVVVVTVNYRLGHLGFFAHPALEEEAGERLYNFALLDQIAALQWVQENIHAFGGDAANVTLFGESAGARSVLSLMASPKAKGLFHKAIIQSGYTLPDLPREKALEKGRLLAEHFALPQASAEELRAIPAEAFWSLTAPLNTGPAPIVGDAVLPQPMLETFFAGRQHPIPVMIGSNSDEASVMAVFGVDIAGQIQKLRRERRLGLGLIKLLYPGVKGDEALGREVCRDMAFTTLGYVVMQAQQRVGQPCWRYWFDYVAEAEHDAYPHGAWHGNEVPYVFDNLRLTDPVRQYASEADLAFAAQVADYWTQFARLASGEQTLSGAVRWPACLRGRDRLLRIGLHKRAGFKVENRFMRARLALFRRVMKHHVTLE

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 1 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

1
  • GO:0004104 Catalysis of the reaction: an acylcholine + H2O = choline + a carboxylic acid anion.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

17 records
Show feature table
Start End DB Term Name
5 500 Gene3D G3DSA:3.40.50.1820 alpha/beta hydrolase
5 500 InterPro IPR029058 Alpha/Beta hydrolase fold
84 94 ProSitePatterns PS00941 Carboxylesterases type-B signature 2.
84 94 InterPro IPR019819 Carboxylesterase type B, conserved site
6 495 SUPERFAMILY SSF53474 alpha/beta-Hydrolases
6 495 InterPro IPR029058 Alpha/Beta hydrolase fold
353 475 Pfam PF00135 Carboxylesterase family
353 475 InterPro IPR002018 Carboxylesterase, type B
6 327 Pfam PF00135 Carboxylesterase family
6 327 InterPro IPR002018 Carboxylesterase, type B
182 197 ProSitePatterns PS00122 Carboxylesterases type-B serine active site.
182 197 InterPro IPR019826 Carboxylesterase type B, active site
400 412 PRINTS PR00878 Cholinesterase signature
400 412 InterPro IPR000997 Cholinesterase
108 137 PRINTS PR00878 Cholinesterase signature
108 137 InterPro IPR000997 Cholinesterase
7 460 PANTHER PTHR11559 CARBOXYLESTERASE

3D structure

Selected loaded structure. Experimental PDB entries may cover only a portion of the sequence; AlphaFold DB and ColabFold models typically cover the full protein but remain computational predictions.

Download VMD script Full viewer

Loading 3D structure...

Drag to rotate — click the view, then scroll to zoom.

Pocket score High Medium Low
How colors and pocket overlays are used
Uniform protein color marks the displayed model as a single molecular object.
Experimental PDB structures may be colored by chain to distinguish subunits or copies present in the file.
Pocket colors and alpha spheres are evidence overlays for predicted binding cavities; they are not alternative protein chains.
'Alpha spheres' is FPocket's own cavity-shape geometry, imported when available and aligned with the loaded structure.
'Pocket atoms'/'Predicted site atoms' show the pocket's residue atoms instead: P2Rank reports residues rather than alpha spheres, and FPocket falls back to this when alpha-sphere geometry is unavailable or doesn't align.
'No pocket geometry' means neither alpha spheres nor residue-position data could be found for that pocket; the layer just highlights the same residues as 'Nearby residues'.
Pocket details Inspect a specific pocket, or open the full viewer

Binding pockets · P2Rank

Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Pocket 1 P2Rank #1
0.926
Show in viewer
Surrounding area
Pocket 2 P2Rank #2
0.868
Likely same site as FPocket 37 5.1 Å 20 shared residues 74% of smaller site
Show in viewer
Surrounding area
Pocket 3 P2Rank #3
0.411
Show in viewer
Surrounding area
Pocket 4 P2Rank #4
0.137
Show in viewer
Surrounding area

Binding pockets · FPocket

Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4

Pocket 1 FPocket #37
0.932 Unusual size
Likely same site as P2Rank 2 5.1 Å 20 shared residues 74% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Active site:195-195 Acyl-ester intermediate
UniProt: Active site:308-308 Charge relay system
UniProt: Active site:400-400 Charge relay system
All structural evidence 0 experimental · 2 predicted

Structural evidence

0 + 2

Experimental PDB entries plus predicted AlphaFold DB or ColabFold models. Click Switch to display a different loaded structure in the viewer.

Entry Method Resolution Chain Coverage Links Status
AlphaFold DB AF_A0A0H3GTK4
AlphaFold DB full sequence Viewing
ColabFold VK055_0532
ColabFold full sequence Loaded

Ligand evidence

Ligands grouped by evidence source. PDB ligands keep the source crystal visible, and loaded crystals can be opened directly in the structure viewer.

167 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 117 records from similar proteins
Structural ligands 17 0 loaded crystals
Measured bioactivity 100 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
CFQ PDB via homolog 369.2 Da · LogP 4.44 · TPSA 49.5 Open detail RCSB PDB
CHD PDB via homolog Detail RCSB PDB
DME PDB via homolog Detail RCSB PDB
EDR PDB via homolog Detail RCSB PDB
FJN PDB via homolog Detail RCSB PDB

Structural evidence inferred from similar proteins. The source crystal indicates where the ligand was observed; the UniProt column identifies the homologous protein carrying that ligand.

Show only:
Ligand Source crystal UniProt (homolog) MW · LogP · TPSA Lipinski PAINS SMILES
CFQ RCSB PDB P04058 369.2 Da LogP 4.44 TPSA 49.5 ✓ Ro5 ✓ Clean C[As+](C)(C)CCO[C@@H](c1ccccc1[N+](=O)O)C(F)(F)F
CHD RCSB PDB P23141 408.6 Da LogP 3.45 TPSA 98.0 ✓ Ro5 ✓ Clean C[C@H](CCC(=O)O)[C@H]1CC[C@@H]2[C@@]1([C@H](C[C…
DME RCSB PDB P04058 258.5 Da LogP 3.52 TPSA 0.0 ✓ Ro5 ✓ Clean C[N+](C)(C)CCCCCCCCCC[N+](C)(C)C
EDR RCSB PDB P04058 166.2 Da LogP 1.98 TPSA 20.2 ✓ Ro5 ✓ Clean CC[N+](C)(C)c1cccc(c1)O
FJN RCSB PDB P04058 673.8 Da LogP 2.80 TPSA 133.9 1 viol. ✓ Clean C[NH+](Cc1ccnc(c1)NC(=O)Nc2cccc3c2[C@@H]4CCCCN4…
G3X RCSB PDB P04058 398.5 Da LogP 3.10 TPSA 45.2 ✓ Ro5 ✓ Clean COc1ccc2c3c1O[C@@H]4[C@@]3(CC[N@](C2)CCCN5CCCCC…
HTQ RCSB PDB P23141 275.3 Da LogP 1.89 TPSA 49.8 ✓ Ro5 ✓ Clean CN1[C@H]2CC[C@@H]1CC(C2)OC(=O)[C@@H](c3ccccc3)O
MF2 RCSB PDB P04058 270.4 Da LogP 2.18 TPSA 41.6 ✓ Ro5 ✓ Clean C[C@@H]1CN(C[C@@H](O1)C)CCCCCCCCNC=O
NAF RCSB PDB P04058 250.2 Da LogP 1.58 TPSA 40.5 ✓ Ro5 ✓ Clean C[N+](C)(C)c1cccc(c1)C(C(F)(F)F)(O)O
PE7 RCSB PDB P04058 342.5 Da LogP 0.01 TPSA 75.6 ✓ Ro5 ✓ Clean C(COCCOCCOCCOCCOCCOCCS)O
PLM RCSB PDB P23141 256.4 Da LogP 5.55 TPSA 37.3 1 viol. ✓ Clean CCCCCCCCCCCCCCCC(=O)O
SIA RCSB PDB P23141 309.3 Da LogP -3.87 TPSA 176.8 1 viol. ✓ Clean CC(=O)N[C@@H]1[C@H](C[C@@](O[C@H]1[C@@H]([C@@H]…
TCH RCSB PDB P23141 515.7 Da LogP 2.37 TPSA 144.2 1 viol. ✓ Clean C[C@H](CCC(=O)NCCS(=O)(=O)O)[C@H]1CC[C@@H]2[C@@…
TJH RCSB PDB P04058 447.9 Da LogP 4.44 TPSA 91.3 ✓ Ro5 Alert c1cc2c(c(c1)O)C(=O)C=C(C2=O)NCCNc3c4ccc(cc4nc5c…
VXA RCSB PDB P04058 79.0 Da LogP -0.55 TPSA 40.1 ✓ Ro5 ✓ Clean C[P@H](=O)[O-]
WW2 RCSB PDB P23141 180.2 Da LogP 3.13 TPSA 26.3 ✓ Ro5 ✓ Clean C[P@](=O)(OC1CCCCC1)F
XE RCSB PDB P04058 131.3 Da LogP 0.00 TPSA 0.0 ✓ Ro5 ✓ Clean [Xe]

PDB and ChEMBL records on this protein are shown in full. ChEMBL records from similar proteins are capped at the top 100 per protein (by pchembl) and ZINC at the top 50 (Tanimoto ≥ 0.5). ADME columns are descriptor-based screening flags, not experimental toxicity results.

Cross-references

External database identifiers for this protein, its structures, ligands, and metabolic reactions.

Chemistry

ChEMBL CHEMBL525622 ChEMBL CHEMBL606348 ChEMBL CHEMBL594870 ChEMBL CHEMBL193228 ChEMBL CHEMBL596236 ChEMBL CHEMBL3221007 ChEMBL CHEMBL593933 ChEMBL TZ5 ChEMBL CHEMBL606372 ChEMBL CHEMBL208599 ChEMBL CHEMBL3221005 ChEMBL CHEMBL2393107 ChEMBL CHEMBL467451 ChEMBL CHEMBL4290236 ChEMBL CHEMBL315634 ChEMBL CHEMBL86546 ChEMBL CHEMBL463556 ChEMBL CHEMBL467450 ChEMBL CHEMBL3221566 ChEMBL CHEMBL4293626 ChEMBL CHEMBL155514 ChEMBL CHEMBL2393227 ChEMBL CHEMBL413727 ChEMBL CHEMBL464002 ChEMBL CHEMBL460806 ChEMBL CHEMBL460807 ChEMBL CHEMBL448922 ChEMBL CHEMBL449775 ChEMBL CHEMBL540657 ChEMBL CHEMBL2393229 ChEMBL CHEMBL483090 ChEMBL CHEMBL1812859 ChEMBL CHEMBL605303 ChEMBL CHEMBL3221009 ChEMBL CHEMBL175854 ChEMBL CHEMBL449475 ChEMBL CHEMBL91416 ChEMBL CHEMBL2393108 ChEMBL CHEMBL3217792 ChEMBL CHEMBL3221283 ChEMBL CHEMBL2393109 ChEMBL CHEMBL3221006 ChEMBL CHEMBL235503 ChEMBL CHEMBL3221008 ChEMBL CHEMBL192139 ChEMBL CHEMBL594187 ChEMBL CHEMBL3221292 ChEMBL CHEMBL595114 ChEMBL CHEMBL238062 ChEMBL CHEMBL238063 ChEMBL CHEMBL93675 ChEMBL CHEMBL362996 ChEMBL CHEMBL3752467 ChEMBL CHEMBL1812864 ChEMBL CHEMBL190672 ChEMBL CHEMBL86668 ChEMBL CHEMBL107516 ChEMBL CHEMBL4282357 ChEMBL CHEMBL86868 ChEMBL CHEMBL3221275 ChEMBL CHEMBL51931 ChEMBL CHEMBL4849361 ChEMBL CHEMBL2393111 ChEMBL CHEMBL108313 ChEMBL CHEMBL108696 ChEMBL CHEMBL1812856 ChEMBL CHEMBL367966 ChEMBL CHEMBL3221290 ChEMBL CHEMBL3221286 ChEMBL CHEMBL460808 ChEMBL E20 ChEMBL CHEMBL1678 ChEMBL CHEMBL3221565 ChEMBL CHEMBL3221285 ChEMBL CHEMBL4285759 ChEMBL CHEMBL419926 ChEMBL CHEMBL270374 ChEMBL CHEMBL293277 ChEMBL CHEMBL490866 ChEMBL CHEMBL3221287 ChEMBL TFC ChEMBL CHEMBL4855755 ChEMBL CHEMBL261172 ChEMBL CHEMBL4101254 ChEMBL CHEMBL519154 ChEMBL CHEMBL278020 ChEMBL CHEMBL4071772 ChEMBL CHEMBL1812857 ChEMBL CHEMBL519475 ChEMBL CHEMBL4090451 ChEMBL CHEMBL179760 ChEMBL CHEMBL182199 ChEMBL CHEMBL235287 ChEMBL CHEMBL3221568 ChEMBL CHEMBL91417 ChEMBL CHEMBL108749 ChEMBL CHEMBL4853637 ChEMBL CHEMBL440542 ChEMBL CHEMBL192180 ChEMBL CHEMBL402615